pLUTo's performance can be further improved by utilizing the parallelism available across subarrays, as demonstrated in MASA [1]} (described in Section REF ). pLUTo leverages MASA to operate on multiple subarrays in parallel.
The degree of parallelism which can be achieved in practice is limited by the JEDEC DRAM Standard [2]}, [3]}, which specifies a limit for the rate of issuing activate commands.
This limit is dictated by the \(T_{FAW}\)  timing parameter, which indicates the time window during which at most four activate commands can be issued, per DRAM rank.
Therefore, parallel activations to different subarrays in the same rank are limited.
Since this constraint serves to prevent deterioration of the DRAM reference voltage, \(T_{FAW}\)  may be reduced with the use of, for example, more powerful charge pumps.
DRAM manufacturers have been able to reduce the value of \(T_{FAW}\)  in DDR3 chips in recent years [4]}.
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